Needle valve assembly
US4019534A · kind A · utility
6Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Oct 6, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88038
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A low flow needle valve assembly is described having a non-metallic valve stem guide and a cross-flow system such that fluid flow occurs over only metallic metering surfaces. The valve assembly is particularly advantageous in view of its low cost and its smooth, non-reversing flow characteristics which result in precise control of extremely low fluid flow rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.